org.springframework.expression.common
Class ExpressionUtils

java.lang.Object
  org.springframework.expression.common.ExpressionUtils

public abstract class ExpressionUtils
extends Object

Common utility functions that may be used by any Expression Language provider.

Since:

3.0

Author:

Andy Clement, Juergen Hoeller

Constructor Summary

ExpressionUtils()

Method Summary

static <T> T	convert(EvaluationContext context, Object value, Class<T> targetType) Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type.
static <T> T	convertTypedValue(EvaluationContext context, TypedValue typedValue, Class<T> targetType) Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionUtils

public ExpressionUtils()

Method Detail

convert

public static <T> T convert(EvaluationContext context,
                            Object value,
                            Class<T> targetType)
                 throws EvaluationException

Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type. Throws an exception if conversion is not possible.

Parameters:

context - the evaluation context that may define a type converter

value - the value to convert (may be null)

targetType - the type to attempt conversion to

Returns:

the converted value

Throws:

EvaluationException - if there is a problem during conversion or conversion of the value to the specified type is not supported

convertTypedValue

public static <T> T convertTypedValue(EvaluationContext context,
                                      TypedValue typedValue,
                                      Class<T> targetType)

Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type. Throws an exception if conversion is not possible.

Parameters:

context - the evaluation context that may define a type converter

typedValue - the value to convert and a type descriptor describing it

targetType - the type to attempt conversion to

Returns:

the converted value

Throws:

EvaluationException - if there is a problem during conversion or conversion of the value to the specified type is not supported